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[md_5 <1082244@xxxxxxxxxxxxxxxxxx>]

Can confirm in upstream 3.17

** Changed in: linux (Ubuntu)
       Status: Expired => Confirmed

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https://bugs.launchpad.net/bugs/1082244

Title:
  [Dell XPS 15z] Needs kernel parameter 'acpi_backlight=vendor
  dell_laptop.backlight=0' or 'acpi=noirq' to boot

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Same issue as experienced here:
  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1072891

  I have been asked to report it as a new bug.

  System will not boot without 'acpi=off' as the parameter.

  WORKAROUND: Adding 'acpi_backlight=vendor dell_laptop.backlight=0'
  instead of 'acpi=noirq' as the parameter works.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-32-generic 3.2.0-32.51
  ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
  Uname: Linux 3.2.0-32-generic x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu15
  Architecture: amd64
  ArecordDevices:
   **** List of CAPTURE Hardware Devices ****
   card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
     Subdevices: 1/1
     Subdevice #0: subdevice #0
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  brucey     1781 F.... pulseaudio
  Card0.Amixer.info:
   Card hw:0 'PCH'/'HDA Intel PCH at 0xf1c00000 irq 26'
     Mixer name	: 'Intel CougarPoint HDMI'
     Components	: 'HDA:10ec0269,10280446,00100100 HDA:80862805,80860101,00100000'
     Controls      : 24
     Simple ctrls  : 11
  Date: Fri Nov 23 03:32:54 2012
  HibernationDevice: RESUME=UUID=f9f58c1b-cae5-44aa-a191-07865f57e282
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120328)
  MachineType: Dell Inc. Dell System XPS 15Z
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-32-generic root=UUID=86ba79e8-35ed-407b-a69d-2633fc2a421a ro acpi=noirq quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-32-generic N/A
   linux-backports-modules-3.2.0-32-generic  N/A
   linux-firmware                            1.79.1
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/27/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A04
  dmi.board.name: 060G42
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA04:bd07/27/2011:svnDellInc.:pnDellSystemXPS15Z:pvr:rvnDellInc.:rn060G42:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Dell System XPS 15Z
  dmi.sys.vendor: Dell Inc.

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